class Counter{
    public static int count=0;
    public  static void add(){
        synchronized(Counter.class){
            count++;
        }
    }
    public int get(){
        return count;
    }

}
public class demo21 {
    public static void main(String[] args) throws InterruptedException {
        Counter counter=new Counter();
        Thread t1=new Thread(()->{
            for(int i=0;i<50000;i++){
                counter.add();
            }
        });
        Thread t2=new Thread(()->{
            for(int i=0;i<50000;i++){
                counter.add();
            }
        });
        t1.start();
        t2.start();
        t1.join();
        t2.join();
        System.out.println(counter.get());

    }
}
